This study aims to utilize the high-speed flow visualization and droplet size analysis technology to experimentally investigate the effects of surfactant concentration and thread induced turbulence modulation on the coaxial jet atomization characteristics. After adding turbulence modulation, a larger initial amplitude appeared on the jet surface, which is the reason for the reduction in breakup length and droplet size. Due to the Marangoni effect and capillary pressure, the breakup length increases overall with the increase of surfactant concentration, except for a sudden decrease at the critical micelle concentration (CMC). The droplet size generated by the jet disintegration shows a nonmonotonic trend with the surfactant concentration, reaching the minimum value at CMC. Finally, the results indicate that an increase in the pitch of thread structure leads to a better atomization performance.

中文翻译：

---

螺纹结构诱导的湍流调制在含表面活性剂射流的同轴空气喷射雾化中的作用的实验研究


本研究旨在利用高速流动可视化和液滴粒径分析技术，实验研究表面活性剂浓度和线致湍流调制对同轴射流雾化特性的影响。加入湍流调制后，射流表面出现了较大的初始振幅，这是破裂长度和液滴尺寸减小的原因。由于马兰戈尼效应和毛细管压力，破裂长度总体上随着表面活性剂浓度的增加而增加，除了在临界胶束浓度 （CMC） 处突然降低。射流分解产生的液滴尺寸随表面活性剂浓度呈非单调趋势，在 CMC 处达到最小值。最后，结果表明，螺纹结构螺距的增加导致更好的原子化性能。